Huin Jokjebi Yangege Jugeumeul!

A thousand years have passed since a princess of Balhalla destroyed her country and was transformed into an immortal white ferret. She encounters a young man who can understand her despite her animal form and claims to be her first love, expressing endless affection. While he remains devoted, she plans to use him to end her immortal existence. Together, they embark on a journey to break a curse, facing various challenges along the way.